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Distribution of soil fractions and location of soil bacteria in a vertisol under cultivation and perennial grass (1994)

Kabir, M. ; Chotte, J. L. ; Rahman, M. ; [et al.]

Springer

Plant and soil 163 (1994), S. 243-255

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ISSN: 1573-5036

Keywords: Azospirillum brasilense ; Digitaria decumbens ; microbial biomass C ; regrass soil ; rhizosphere ; soil fractionation ; vertisol

Source: Springer Online Journal Archives 1860-2000

Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition

Notes: Abstract Effects of soil management on soil characteristics were investigated on the rhizosphere (RPP) and the nonrhizosphere (NRPP) soil of a re-grass vertisol underDigitaria decumbens and in the soil under continuous cultivation (CC). A low energy technique allowed to separate eight size and density fractions, including macro- and micro-aggregates while preserving soil bacteria. Organic C and N, microbial biomass C and the number of total bacteria (AODC) and ofAzospirillum brasilense and their distribution were determined in soil fractions isolated from the CC, NRPP and RPP soils. Soil macroaggregates (〉2000 μm) were similarly predominant in the NRPP and RPP soils when the dispersible clay size fraction (〈2 μm) respresented more than 25% of the CC soil mass. The main increase of C content in RPP originated from the macroaggregates (〉 2000 μm) and from the root fraction, not from the finer separates. The proportion of organic C as microbial biomass C revealed the low turnover of microbial C in the PP situations, especially in the clay size fraction of the NRPP soil. A common shift of AODC toward the finer separates from planted soils (CC and RPP) revealed the influence of living plants on the distribution of soil bacteria. The relative abundance ofA. brasilense showed the presence of the active roots ofDigitaria in the macroaggregates and their contact with the dispersible clay size fraction of the rhizosphere soil.

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1007/BF00007974

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Dual-column GC analysis of mediterranean fish for ten organochlorine pesticides and sixty two chlorobiphenyls (1993)

Rahman, M. S. ; Bøwadt, S. ; Larsen, B.

Weinheim : Wiley-Blackwell

Journal of High Resolution Chromatography 16 (1993), S. 731-735

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ISSN: 0935-6304

Keywords: GC-ECD ; Dual-column ; Organochlorine pesticides ; Chlorobiphenyl congeners ; Fish ; Chemistry ; Analytical Chemistry and Spectroscopy

Source: Wiley InterScience Backfile Collection 1832-2000

Topics: Chemistry and Pharmacology

Notes: The simultaneous analysis of α-HCH, β-HCH, γ-HCH, HCB, p,p′-DDD, p,p′-DDT, p,p′-DDE, o,p′-DDT, mirex, dieldrin and 62 chlorobiphenyl congeners on two parallel capillary GC columns of different polarity is described for nine Mediterranean fish species. Ten commercially available columns with stationary phases completely characterized in respect of their PCB elution patterns were considered for dual-column GC-ECD analysis. The combination of a 60 m × 0.25 mm i.d. column coated with a 0.25 μm film of 50% diphenyl dimethylsiloxane and a series combination of a 25 m × 0.25 mm i.d. column coated with a 0.25 μm film of 5% diphenyl dimethylsiloxane with a 25 m × 0.22 mm i.d. column coated with a 0.10 μm film of 1, 10-dicarba-closo-dodecarborane dimethylpolysiloxane furnished the highest number of separated chlorobiphenyl congeners (104). The dual-column GC system performed with high stability and reproducibility over a broad concentration range (1-3000 ng/g lipid) of the organochlorine compounds in the investigated fish.

Additional Material: 1 Ill.